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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e587860ce7efc680e95efbddead7ff2cfe76d054e935c3f8017856f4bde9ae0e' 
  AND token = '2HZysLVsecHomWi+BbU+Thsg9d7jxFPpscrxbAf44Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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