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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdac5fe400fcbd33e6502101828b46addc9bb345c4e5188e1b43b7c6a67db9c' 
  AND token = 'A5b6/PXpiepVkcGcXnuZs7+ftQioXPotCS8VabBij+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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