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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80918d8174b3663de0cb3185d1cd7c78993cc4162b8f0acf7af78388e9100e7c' 
  AND token = 'edK8qM3k+8ZTZe2ctNdtGPTLdUkEzv92pdepXA7CqSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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