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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0942ae4d233ce5b3aec55209e4862a40c9cd25fccd67a65cbc8b83ab9a63a534' 
  AND token = '1lyDLVjotzsvruZjj6h17b8Z9yR4ZbwqjqPt99jrzVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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