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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b066c4c48904e3dfa2c4c4391f9dd98aeac3f30f7d228e45050e198934fb6bb0' 
  AND token = 'oGS4+1fOgAm15vbdOtqrk6+ErW181JyeXpI+al30uyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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