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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb37545bd5ee2b11ee9d956ce4cf6cb7c62bbb7865e714b3714717d238309500' 
  AND token = '+fQxgpa0Bi5ssTPTAowvPGFjwnjRGzbOy2nUk5gN2vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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