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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd6e15dd0d2cdef431fb12913c99a249b533f6b4bd920be667003b718aa1d5f' 
  AND token = '7StajCeg9Dmb3T1B8fgGJ8rYcsioedoo3D4vjME8+aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}